I found out something about sound in tunnels. A car or truck can be a quarter mile away in the tunnel, but the sound of the engine is funneled and reflected to the point that it sounds like a jet plane right behind you. It was mildly terrifying.
As promised, here is the gratuitous bear cub. The bears are emerging from hibernation, and we saw a mother Black Bear and her cub above the highway near Chinquapin (the turnoff to Glacier Point). They were being good and doing bear things in the forest instead of breaking into cars in a campground. It's taken a few years, but most of the tourists have finally been trained to stop luring bears into the campgrounds, and the crafty old campground bears have died off or retired, and there aren't new mama bears teaching their cubs how to break in. In the late 1990s nearly a million dollars of damage was done by the bears, but in the most recent year the damage was only about $5,000. For the record, although the bears are incredibly strong and heavily armed (clawed), they have been very patient with humans. There has not been a single fatality in the Sierra Nevada that can be attributed to a Black Bear. We have unfortunately killed lots of them, mostly with traffic collisions. The extinct California Grizzly Bears were a different story.